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    <div class="refentry" id="glGetProgramStage">
      <div class="titlepage"/>
      <div class="refnamediv">
        <h2>Name</h2>
        <p>glGetProgramStage — retrieve properties of a program object corresponding to a specified shader stage</p>
      </div>
      <div class="refsynopsisdiv">
        <h2>C Specification</h2>
        <div class="funcsynopsis">
          <table style="border: 0; cellspacing: 0; cellpadding: 0;" class="funcprototype-table">
            <tr>
              <td>
                <code class="funcdef">void <strong class="fsfunc">glGetProgramStageiv</strong>(</code>
              </td>
              <td>GLuint <var class="pdparam">program</var>, </td>
            </tr>
            <tr>
              <td> </td>
              <td>GLenum <var class="pdparam">shadertype</var>, </td>
            </tr>
            <tr>
              <td> </td>
              <td>GLenum <var class="pdparam">pname</var>, </td>
            </tr>
            <tr>
              <td> </td>
              <td>GLint *<var class="pdparam">values</var><code>)</code>;</td>
            </tr>
          </table>
          <div class="funcprototype-spacer"> </div>
        </div>
      </div>
      <div class="refsect1" id="parameters">
        <h2>Parameters</h2>
        <div class="variablelist">
          <dl class="variablelist">
            <dt>
              <span class="term">
                <em class="parameter">
                  <code>program</code>
                </em>
              </span>
            </dt>
            <dd>
              <p>
                    Specifies the name of the program containing shader stage.
                </p>
            </dd>
            <dt>
              <span class="term">
                <em class="parameter">
                  <code>shadertype</code>
                </em>
              </span>
            </dt>
            <dd>
              <p>
                    Specifies the shader stage from which to query for the subroutine parameter. <em class="parameter"><code>shadertype</code></em>
                    must be one of <code class="constant">GL_VERTEX_SHADER</code>, <code class="constant">GL_TESS_CONTROL_SHADER</code>,
                    <code class="constant">GL_TESS_EVALUATION_SHADER</code>, <code class="constant">GL_GEOMETRY_SHADER</code> or
                    <code class="constant">GL_FRAGMENT_SHADER</code>.
                </p>
            </dd>
            <dt>
              <span class="term">
                <em class="parameter">
                  <code>pname</code>
                </em>
              </span>
            </dt>
            <dd>
              <p>
                    Specifies the parameter of the shader to query. <em class="parameter"><code>pname</code></em>
                    must be <code class="constant">GL_ACTIVE_SUBROUTINE_UNIFORMS</code>,
                    <code class="constant">GL_ACTIVE_SUBROUTINE_UNIFORM_LOCATIONS</code>,
                    <code class="constant">GL_ACTIVE_SUBROUTINES</code>,
                    <code class="constant">GL_ACTIVE_SUBROUTINE_UNIFORM_MAX_LENGTH</code>,
                    or <code class="constant">GL_ACTIVE_SUBROUTINE_MAX_LENGTH</code>.
                </p>
            </dd>
            <dt>
              <span class="term">
                <em class="parameter">
                  <code>values</code>
                </em>
              </span>
            </dt>
            <dd>
              <p>
                    Specifies the address of a variable into which the queried value or values will be placed.
                </p>
            </dd>
          </dl>
        </div>
      </div>
      <div class="refsect1" id="description">
        <h2>Description</h2>
        <p>
            <code class="function">glGetProgramStage</code> queries a parameter of a shader stage attached to a program object.
            <em class="parameter"><code>program</code></em> contains the name of the program to which the shader is attached. <em class="parameter"><code>shadertype</code></em>
            specifies the stage from which to query the parameter. <em class="parameter"><code>pname</code></em> specifies which parameter
            should be queried. The value or values of the parameter to be queried is returned in the variable whose address
            is given in <em class="parameter"><code>values</code></em>.
        </p>
        <p>
            If <em class="parameter"><code>pname</code></em> is <code class="constant">GL_ACTIVE_SUBROUTINE_UNIFORMS</code>, the number
            of active subroutine variables in the stage is returned in <em class="parameter"><code>values</code></em>.
        </p>
        <p>
            If <em class="parameter"><code>pname</code></em> is <code class="constant">GL_ACTIVE_SUBROUTINE_UNIFORM_LOCATIONS</code>,
            the number of active subroutine variable locations in the stage is returned in <em class="parameter"><code>values</code></em>.
        </p>
        <p>
            If <em class="parameter"><code>pname</code></em> is <code class="constant">GL_ACTIVE_SUBROUTINES</code>,
            the number of active subroutines in the stage is returned in <em class="parameter"><code>values</code></em>.
        </p>
        <p>
            If <em class="parameter"><code>pname</code></em> is <code class="constant">GL_ACTIVE_SUBROUTINE_UNIFORM_MAX_LENGTH</code>,
            the length of the longest subroutine uniform for the stage is returned in <em class="parameter"><code>values</code></em>.
        </p>
        <p>
            If <em class="parameter"><code>pname</code></em> is <code class="constant">GL_ACTIVE_SUBROUTINE_MAX_LENGTH</code>,
            the length of the longest subroutine name for the stage is returned in <em class="parameter"><code>values</code></em>. The
            returned name length includes space for the null-terminator.
        </p>
        <p>
            If there is no shader present of type <em class="parameter"><code>shadertype</code></em>, the returned value will be consistent
            with a shader containing no subroutines or subroutine uniforms.
        </p>
      </div>
      <div class="refsect1" id="errors">
        <h2>Errors</h2>
        <p>
            <code class="constant">GL_INVALID_ENUM</code> is generated if <em class="parameter"><code>shadertype</code></em> or <em class="parameter"><code>pname</code></em>
            is not one of the accepted values.
        </p>
        <p>
            <code class="constant">GL_INVALID_VALUE</code> is generated if <em class="parameter"><code>program</code></em> is not the name of an
            existing program object.
        </p>
      </div>
      <div class="refsect1" id="versions">
        <h2>Version Support</h2>
        <div class="informaltable">
          <table style="border-collapse: collapse; border-top: 2px solid ; border-bottom: 2px solid ; border-left: 2px solid ; border-right: 2px solid ; ">
            <colgroup>
              <col style="text-align: left; "/>
              <col style="text-align: center; " class="firstvers"/>
              <col style="text-align: center; "/>
              <col style="text-align: center; "/>
              <col style="text-align: center; "/>
              <col style="text-align: center; "/>
              <col style="text-align: center; "/>
              <col style="text-align: center; "/>
              <col style="text-align: center; "/>
              <col style="text-align: center; "/>
              <col style="text-align: center; "/>
              <col style="text-align: center; "/>
              <col style="text-align: center; " class="lastvers"/>
            </colgroup>
            <thead>
              <tr>
                <th style="text-align: left; border-right: 2px solid ; ">
                 
            </th>
                <th style="text-align: center; border-bottom: 2px solid ; " colspan="12">
                <span class="bold"><strong>OpenGL Version</strong></span>
            </th>
              </tr>
              <tr>
                <th style="text-align: left; border-right: 2px solid ; border-bottom: 2px solid ; ">
                <span class="bold"><strong>Function / Feature Name</strong></span>
            </th>
                <th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">
                <span class="bold"><strong>2.0</strong></span>
            </th>
                <th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">
                <span class="bold"><strong>2.1</strong></span>
            </th>
                <th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">
                <span class="bold"><strong>3.0</strong></span>
            </th>
                <th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">
                <span class="bold"><strong>3.1</strong></span>
            </th>
                <th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">
                <span class="bold"><strong>3.2</strong></span>
            </th>
                <th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">
                <span class="bold"><strong>3.3</strong></span>
            </th>
                <th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">
                <span class="bold"><strong>4.0</strong></span>
            </th>
                <th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">
                <span class="bold"><strong>4.1</strong></span>
            </th>
                <th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">
                <span class="bold"><strong>4.2</strong></span>
            </th>
                <th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">
                <span class="bold"><strong>4.3</strong></span>
            </th>
                <th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">
                <span class="bold"><strong>4.4</strong></span>
            </th>
                <th style="text-align: center; border-bottom: 2px solid ; ">
                <span class="bold"><strong>4.5</strong></span>
            </th>
              </tr>
            </thead>
            <tbody>
              <tr>
                <td style="text-align: left; border-right: 2px solid ; ">
                  <code class="function">glGetProgramStageiv</code>
                </td>
                <td style="text-align: center; border-right: 2px solid ; ">-</td>
                <td style="text-align: center; border-right: 2px solid ; ">-</td>
                <td style="text-align: center; border-right: 2px solid ; ">-</td>
                <td style="text-align: center; border-right: 2px solid ; ">-</td>
                <td style="text-align: center; border-right: 2px solid ; ">-</td>
                <td style="text-align: center; border-right: 2px solid ; ">-</td>
                <td style="text-align: center; border-right: 2px solid ; ">✔</td>
                <td style="text-align: center; border-right: 2px solid ; ">✔</td>
                <td style="text-align: center; border-right: 2px solid ; ">✔</td>
                <td style="text-align: center; border-right: 2px solid ; ">✔</td>
                <td style="text-align: center; border-right: 2px solid ; ">✔</td>
                <td style="text-align: center; ">✔</td>
              </tr>
            </tbody>
          </table>
        </div>
      </div>
      <div class="refsect1" id="seealso">
        <h2>See Also</h2>
        <p>
            <a class="citerefentry" href="glGetProgram.xhtml"><span class="citerefentry"><span class="refentrytitle">glGetProgram</span></span></a>
        </p>
      </div>
      <div class="refsect1" id="Copyright">
        <h2>Copyright</h2>
        <p>
            Copyright <span class="trademark"/>© 2010-2014 Khronos Group.
            This material may be distributed subject to the terms and conditions set forth in
            the Open Publication License, v 1.0, 8 June 1999.
            <a class="link" href="http://opencontent.org/openpub/" target="_top">http://opencontent.org/openpub/</a>.
        </p>
      </div>
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